Boot Camp on Mountain Lion

macrumors G3

I'm having problems creating a bootable Windows 7 USB drive using Boot Camp on Mountain Lion. It formats and copies the files to the USB drive fine, but when it reboots and starts the Windows installation process, I get an error (in some form of MS-DOS) that there's no bootable devices found.

The alternative is to burn the .iso to a DVD, but I've forgotten how I did that in the first place and I've no DVD's either.

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